Hmm ... i see that noone here enjoyed Enterprise as much as i did ...
I haven't seen DS9 ... maybe that's it ... but i simply loved Enterprise. I like the approach on each episode, from a character's point of view.
I liked most of the crew, much more than in TNG ... Trip (Tucker) is my favorite character in this show. Followed closely by Archer, Phlox, Travis, T'Pol and Reed. Also, besides the crew, i like the other important characters : Soval , Admiral Forest, Shram the andorian
I think the Xindi thread was a little too much for this series ... you can't leave your home system and after a few years face a planetary attack. it's not realistic ...
My favorite episode is the one in which Enterprise tries to help the valakian people which were facing extinction, due to an unknown virus